I went down the private route, as I could afford to pay for the latest technology. I have been high-tone deaf all my life (discovered by an audiologist visit to primary school when I was about 7), but as I have aged, my deafness has got a lot worse, so decided to bite the bullet 4 months ago.
My aids (behind the ear, receiver in the canal) are really tiny and unobtrusive, and are rechargeable overnight. There were a few hiccups, due to the wax filters constantly clogging up, but I’ve now solved that problem, fortunately.
I can say, it has been quite life changing, being able to hear the TV clearly, and a friend’s voice (who can be a bit of a mumbler!) the doorbell, and birds in the garden (not so much the crows…)
To begin with, everything sounds awfully loud, but you adjust, and the advice given to me was to wear them all the time.
I don’t have experience with NHS aids, but have read that they can be very good, but there does seem to be a post code lottery as to which aids you are offered, depending on your local health authority, and how long you might have to wait.